JOURNAL OF FOOD SCIENCE
·
2020
·Vol. 85
·期 12
·4260-4270
·
IF 2.479
Shu Guo,Jiao Wang,Chuanbo He,Haocheng Wei,Ying Ma,Hejian Xiong
Abalone viscera were byproducts of the abalone processing and usually discarded as wastes. In this study, we tried to obtain functional polysaccharides from abalone viscera by a combination of enzymatic hydrolysis, membrane separation, anion exchange chromatography, and gel filtration techniques. Abalone viscera underwent successive hydrolyzation with alcalase and flavourzyme. Each enzymolysis was followed by deproteinization via membrane separation. The final yield of crude abalone viscera polysaccharide (CAVP) was 19.72%; the polysaccharide content of CAVP was 51.75%. Furthermore, three fractions of polysaccharides (AVP1, AVP2, and AVP3) were isolated from the CAVP by anion exchange chromatography and gel filtration. The molecular weights of each AVP were 14.99 kDa, 58.48 kDa, and 39.63 kDa, with a carbohydrate content of 62.75, 23.09, and 44.67%, respectively. These AVPs showed excellent antioxidant activities in vitro. Our results provide a scientific basis for the further utilization of polysaccharides from abalone viscera. Practical Application This study demonstrated an eco-friendly approach for industrial production of high purity animal-derived polysaccharides without any environmental pollution caused by the viscera waste of abalone and promoting the comprehensive utilization of abalone resources.
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高影响因子
FUEL
·
2020
·
IF 5.578
Yong Huang,Shasha Liu,Yishuang Wu,Xun Zhu,Zhixiang Xu,Bin Li,Xun Hu,Hongqi Sun,Jianbin Zhou,Shu Zhang
Char surface functional group has been shown to play an important role in volatile-char interactions during biomass pyrolysis, which are known to be effective for the modification of the pyrolysis products. Using xylose and amino-modified graphitized carbon nanotube (CNT-NH 2 ) as model compounds, the contribution of the designated surface functional group to the evolution of pyrolysis volatile was investigated in this paper by combined theoretical and experimental approaches. The results showed that the interactions between xylose and CNT-NH 2 significantly prevented the ring-opening reaction of xylose to form the most typical anhydrosugar, xylosan, while the ring-contraction reaction of xylose was facilitated to yield furfural. The Density Functional Theory (DFT) calculations demonstrated that two medium hydrogen bonds were formed between the amino group and two hydroxyl groups (1-OH and 3-OH) of xylose with a binding energy of −11.67 kcal/mol, leading to diverse changes in the Mayer bond orders of xylose and thus varying pyrolysis pathways.
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高影响因子
FUEL PROCESSING TECHNOLOGY
·
2020
·
IF 4.982
Kuan Ding,Hao Zhou,Yiling Wan,Yong Huang,Yuming Zhang,Xun Hu,Hong Zhang,Shu Zhang
Ketonization of biomass-derived oxygenates provides an efficient way for bio-oil upgrading. However, little information on the ketonization of oxygen-rich sugars has been reported, leaving the deep deoxygenation of biomass an unsolved challenge. To address the problem, this paper investigated the catalytic pyrolysis of xylose over nano-CeO 2 using an analytical pyrolyzer . Results showed that upon the addition of CeO 2 , multi-functional oxygenated compounds from xylose pyrolysis were majorly reformed to mono-functional ketonic products, resulting in a 5-fold increase in peak area of ketones . Among them, acetone and 2-butanone presented the highest selectivity of 51% with the CeO 2 to xylose ratio of 10:1 at the temperature of 600 °C. Meanwhile, the short-chain oxygenates, i.e. C 2 -C 3 aldehydes and alcohols, had been converted into C 3 -C 5 ketones, indicating an outstanding ability of chain-increasing over CeO 2 . Both the catalyst dosage and the pyrolysis temperature play a vital role during the ketonization process. The reaction mechanism was proposed according to the experimental results, in which three major reaction pathways were analyzed. This study demonstrates that ketonization of biomass-derived sugars is a promising method for oxygen removal and carbon chain increase, thus improving the bio-oil quality.
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BIOSCIENCE BIOTECHNOLOGY AND BIOCHEMISTRY
·
2020
·Vol. 84
·期 9
·1788-1798
·
IF 1.516
Liu Feng,Xu Wen-Fei,Mu Hang,Lv Zhi-Rong,Peng Jie,Guo Chao,Zhou Hai-Meng,Ye Zhuo-Ming,Li Xu-Hui
Many phenolic compounds, derived from lignin during the pretreatment of lignocellulosic biomass, could obviously inhibit the activity of cellulolytic and hemicellulolytic enzymes. Acetosyringone (AS) is one of the phenolic compounds produced from lignin degradation. In this study, we investigated the inhibitory effects of AS on xylanase activity through kinetic experiments. The results showed that AS could obviously inhibit the activity of xylanase in a reversible and noncompetitive binding manner (up to 50% activity loss). Inhibitory kinetics and constants of xylanase on AS were conducted by the HCH-1 model (β = 0.0090 ± 0.0009 mM−1). Furthermore, intrinsic and 8-anilino-1-naphthalenesulfonic (ANS)-binding fluorescence results showed that the tertiary structure of AS-mediated xylanase was altered. These findings provide new insights into the role of AS in xylanase activity. Our results also suggest that AS was an inhibitor of xylanase and targeting AS was a potential strategy to increase xylose production.
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高影响因子
Marine Drugs
·
2020
·Vol. 18
·期 9
·444
·
IF 4.073
Bin Wei,Qi-Wu Zhong,Song-Ze Ke,Tao-Shun Zhou,Qiao-Li Xu,Si-Jia Wang,Jian-Wei Chen,Hua-Wei Zhang,Wei-Hua Jin,Hong Wang
A low fasting blood glucose level is a common symptom in diabetes patients and can be induced by high-fat diet (HFD) feeding at an early stage, which may play important roles in the development of diabetes, but has received little attention. In this study, five polysaccharides were prepared fromSargassumfusiformeand their effects on HFD-induced fasting hypoglycemia and gut microbiota dysbiosis were investigated. The results indicated that C57BL/6J male mice fed an HFD for 4 weeks developed severe hypoglycemia and fourSargassumfusiformepolysaccharides (SFPs), consisting of Sf-2, Sf-3, Sf-3-1, and Sf-A, significantly prevented early fasting hypoglycemia without inducing hyperglycemia. Sf-1 and Sf-A could also significantly prevent HFD-induced weight gain. Sf-2, Sf-3, Sf-3-1, and Sf-A mainly attenuated the HFD-induced decrease in Bacteroidetes, and all five SFPs had a considerable influence on the relative abundance ofOscillospira,Mucispirillum, andClostridiales. Correlation analysis revealed that the fasting blood glucose level was associated with the relative abundance ofMucispinllumandOscillospira. Receiver operating characteristic analysis indicated thatMucispinllumandOscillospiraexhibited good discriminatory power (AUC = 0.745–0.833) in the prediction of fasting hypoglycemia. Our findings highlight the novel application of SFPs (especially Sf-A) in glucose homeostasis and the potential roles ofMucispinllumandOscillospirain the biological activity of SFPs.Keywords:Sargassum fusiformepolysaccharides;high-fat diet;gut microbiota;early fasting hypoglycemia
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JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE
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2020
·Vol. 101
·期 7
·2930-2939
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IF 2.614
Xi Yang,Yuan-Yuan Zang,Sha Yang,Zhi-Gang Chen
BACKGROUND Porphyra haitanensis now faces serious heavy metal pollution problems. Natural deep eutectic solvents (NADESs) have been recognized as a novel class of sustainable solvents, which can be used for heavy metal removal. In this study, 28 kinds of NADESs were prepared and investigated as eluent in the removal of lead (Pb), cadmium (Cd), chromium (Cr), arsenic (As), and copper (Cu) from P. haitanensis for the first time, and the adsorption mechanism of NADESs was also studied. RESULTS The removals were greatly improved by NADESs compared with control where the removal rates of Pb, Cd, Cr, As and Cu were 17.4–87.54%, 57.54–100%, 9.8–48.59%, 21.32–78.24% and 11.68–79.73%, respectively. The optimal condition was 10% water content and solid–liquid ratio of 1:20. Moreover, the addition of 20% natural surfactant arabic gum can further increase the heavy metals removal rates of NADESs. The adsorption mechanism experiments showed that the pseudo second-order model and the Freundlich adsorption model can better explain the adsorption mechanism of NADESs on heavy metals removal. CONCLUSION Taken together, a green and efficient method for removing heavy metals from P. haitanensis was established. © 2020 Society of Chemical Industry
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高影响因子
CELLULOSE
·
2020
·Vol. 27
·期 13
·7591-7605
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IF 4.21
Wang Haiyong,Hu Xiaohong,Liu Siwei,Cai Chiliu,Zhu Changhui,Xin Haosheng,Xiu Zhongxun,Wang Chenguang,Liu Qiying,Zhang Qi,Zhang Xinghua,Ma Longlong
The bi-functional Ni–W@C catalysts were prepared by one-pot reduction–carbonization method and used in hydrogenolysis of cellulose as well as raw lignocellulosic biomass to chemicals. The catalytic performance for cellulose conversion showed that it was more favorable for ethylene glycol (EG) production, obtaining the highest EG yield 60.1% over the Ni–W@C 700 catalyst. The Ni–W@C bimetallic catalysts are systematically characterized with BET, XRD, Raman, XPS, TEM techniques and experiments to probe the active catalytic sites of the catalysts. The effects of calcination temperature of Ni–W catalysts, reaction time, temperature and H 2 pressure on cellulose hydrogenolysis were investigated in detail. The Ni particles could lead to produce more W 5+ active sites, which promotes the glucose retro-aldol condensation to break the target C–C bonds. Metallic Ni catalyzed C=O hydrogenation and C–C hydrogenolysis, which could also avoid the coke formation. The EG selectivity was dependent on the synergy of WO x and Ni metal sites. In addition, this synergistic effect between the metal and WO x could promote lignin component degradation in direct conversion of untreated raw lignocellulosic biomass, obtaining the propyl monophenolics including guaiacylpropane, syringylpropane and p-n-propylphenol with a total yield of 17.3 wt% besides EG.
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GREEN CHEMISTRY
·
2019
·Vol. 21
·期 21
·5969-5979
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IF 9.405
Mingwei Ma,Pan Hou,Jingjie Cao,Hui Liu,Xinyu Yan,Xingliang Xu,Huijuan Yue,Ge Tian,Shouhua Feng
A simple basic zirconium carbonate (BZC), which can be produced on a large scale in industry, was studied for hydrogen transfer of biomass-derived carboxides and exhibited excellent catalytic properties at low temperatures, especially for the conversion of furfural (FUR) to furfuryl alcohol (FFA). With the catalyst, the reduction reaction of FUR was efficiently performed at low temperatures (below 100 °C) and an FFA yield of 98.66% was obtained even at room temperature. When the temperature reached 180 °C, the yield of FFA quickly reached 90.29% within 15 minutes. During the reaction, the changes of the functional groups of the reactants and products were monitored by in situ ATR-IR spectroscopy in real time, which provided a basis for the proposed reaction mechanism. Further, the ATR-IR spectroscopy and XPS results of the different catalysts showed that BZC has the strongest acidity among all the comparative catalysts, which is consistent with its best catalytic performance. In addition, reaction kinetics were also studied.
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NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 19
·7968-7975
·
IF 3.288
Tao Yang,Wenzhi Li,Mingxue Su,Yang Liu,Minghou Liu
A novel carbon-based solid acid catalyst (SC-GCa-800) was prepared by the carbonization of calcium gluconate at high-temperature followed by sulfonation with 4-diazoniobenzenesulfonate at room temperature. The catalyst was characterized by FT-IR, XPS, TEM, SEM, TGA, N2 adsorption–desorption and elemental analysis to reveal its physical and chemical properties. Furthermore, the effects of reaction temperature, retention time, substrate concentration, catalyst loading and solvent types were investigated. It was demonstrated that SC-GCa-800 is an efficient solid acid catalyst for furfural production obtained from xylose in 1,4-dioxane. A 76.9% furfural yield can be achieved from 100 mg xylose at 140 °C in 40 min by using a 50 mg catalyst. The catalyst showed high stability and could be recycled five times without a significant loss of catalytic activity. The results indicated that the high catalytic activity of SC-GCa-800 was dependent on its high acidity, BET surface and pore structure. More importantly, the furfural can be obtained at low temperature (100–140 °C) and separated easily from the solvent due to the low boiling point of 1,4-dioxane.
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Advanced Materials Technologies
·
2020
·Vol. 5
·期 7
·2000138
·
IF 5.969
Junjie Hao,Yiwen Li,Xiaoqian Xu,Fenghuan Zhao,Ruikun Pan,Junzi Li,Haochen Liu,Kai Wang,Jiagen Li,Xi Zhu,Marie-Hélène Delville,Ming Zhang,Tingchao He,Jiaji Cheng
Chiral transition metal oxides nanoparticles (NPs) with tunable optical properties are widely accepted as promising toolbox for chiral recognition, stereoselective synthesis, and chiroptical devices. Herein, chirality-based strategy is presented for discrimination of d -glucose from its enantiomer through a cooperative synergy between chiral cysteine capped MoO 2 NPs and the glucose oxidase nanosystem. The valence-state-dependent chirality induced by metal-ligand charge transfer effect is found to be ultrasensitive to its redox environment such as the presence of hydrogen peroxide, which is a key indicator of the stereoselective enzymatic reaction between glucose oxidase and d -glucose. With this know-how, glucose enantiomers can be precisely quantified with a limit of detection of 0.446 µ m . Such a chiral bio-nanosystem would be an ideal platform for a rational design of new types of biosensors, photocatalysts, and chirality-based nanodevices.
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RENEWABLE & SUSTAINABLE ENERGY REVIEWS
·
2020
·
IF 12.11
Yiping Luo,Dong Li,Ruiling Li,Zheng Li,Changwei Hu,Xiaofeng Liu
The roles of water and aluminum sulfate (Al 2 (SO 4 ) 3 ) in one-step selective catalytic transformation of hemicellulose in corn stover were investigated. At 130 °C, 90.2 wt% hemicellulose contained was selectively dissolved and further converted to 85.1 wt% xylose in the presence of Al 2 (SO 4 ) 3 , while keeping cellulose (92.1 wt%) and lignin (88.4 wt%) insignificantly converted. The hemicellulose hydrolysate could be further transformed to lactic acid with the yield of 82.2 wt% using Lactobacillus plantarum via fermentation. H 2 O formed hydrogen bonds with the intermolecular linkages connecting hemicellulose with cellulose and lignin in corn stover, which was helpful to dissolve hemicellulose. The hydrolysis of Al 2 (SO 4 ) 3 formed H + (Brønsted acid), which enhanced selectively the conversion of hemicellulose to xylose. While the active Lewis acid [Al(OH) 2 (H 2 O) x ] + , formed from the hydrolysis of Al 2 (SO 4 ) 3 , could promote the selective dissolution of hemicellulose. The aluminum species could also form complex compounds with –OH 1 and C 1 –O 6 of xylan unit by hydrogen bonds, promoting the production of xylose, as well as inhibiting its further degradation. These findings provided new strategies to develop a low-cost and sustainable corn stover-based biorefinery by understanding and controlling complex reaction networks in biomass conversion.
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JOURNAL OF LUMINESCENCE
·
2020
·
IF 3.28
Pei Yang,Ziqi Zhu,Weimin Chen,Min Luo,Wei Zhang,Tao Zhang,Minzhi Chen,Xiaoyan Zhou
It is still a great challenge to synthesize carbohydrate-derived carbon dots (CDs) with long-wavelength emissions via a green and facile strategy. Herein, novel xylose-derived CDs with green-yellow emission (i.e., GY-CDs) were synthesized due to the doping effect of S and N elements, using a one-pot microwave-assisted hydrothermal method . The maximum emission located at 533 nm under 460 nm excitation, and the absolute quantum yield was as high as 42.44%. To unveil the emission mechanism, green and blue emissive xylose-derived CDs doped with N were also synthesized, respectively. Comparative study and various structural characterizations revealed that introducing protonated amino groups and sulfur-related moieties can narrow the energy gaps within surface states and contribute to the green-yellow emission. Further, the GY-CDs not only displayed transmutation of luminescent centers when the solution pH was above 6, but also exhibited ratiometric fluorescence changes in the pH range of 6–10 under 360 and 460 nm excitation, such distinctive dual-mode response, which together with excellent anti-interference, good water solubility, and outstanding photostability enables the prepared GY-CDs to be potential pH nanosensors .
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